Optical system, method of producing optical system, and optical pickup

A method of producing an optical system having first and second optical lenses, wherein:

• said first optical lens has a substrate comprised of an optical material;
• said substrate has a convex portion serving as a convex lens and an outer circumference portion positioned around said convex portion, a thickness of said substrate at the outer circumference portion being greater than a thickness of said substrate at said convex portion;
• and
• said second optical lens has a first convex portion on one surface, and a second convex portion on another surface opposing said one surface;
• comprising the step of bonding together with an adhesive said outer circumference portion of said first optical lens and an outer circumference portion of said second optical lens so that optical axes of said first and second optical lenses coincide or substantially coincide.

A method of producing an optical system having first and second optical lenses, wherein:

• said first optical lens has a substrate comprised of an optical material;
• and
• said substrate has a convex portion serving as a convex lens and an outer circumference portion positioned around said convex portion, a thickness of said substrate at the outer circumference portion being greater than a thickness of said substrate at said convex portion;
• comprising the step of bonding together said outer circumference portion of said first optical lens and an outer circumference portion of said second optical lens so that optical axes of said first and second optical lenses coincide or substantially coincide, wherein:
• said first optical lens further comprises a flat portion positioned around said convex portion;
• said outer circumference portion of said first optical lens is positioned around said flat portion;
• a thickness of said substrate at said outer circumference portion of said first optical lens is greater than a thickness of said substrate at said flat portion;
• and
• said second optical lens has a first convex portion on one surface, and a second convex portion on another surface opposing said one surface.

A method of producing an optical system having first and second optical lenses, wherein:

• said first optical lens has a substrate comprised of an optical material;
• and
• said substrate has a convex portion serving as a convex lens and an outer circumference portion positioned around said convex portion, a thickness of said substrate at the outer circumference portion being greater than a thickness of said substrate at said convex portion;
• comprising the step of bonding together said outer circumference portion of said first optical lens and an outer circumference portion of said second optical lens so that optical axes of said first and second optical lenses coincide or substantially coincide,
• wherein said outer circumference portion of said first optical lens and said outer circumference portion of said second optical lens are bonded with an adhesive to opposite ends of a ring-shaped intermediate member so that the optical axes of said first and second optical lenses coincide or substantially coincide.

A method of producing an optical system having first and second optical lenses, wherein:

• said first optical lens has a substrate comprised of an optical material;
• and
• said substrate has a convex portion serving as a convex lens and an outer circumference portion positioned around said convex portion, a thickness of said substrate at the outer circumference portion being greater than a thickness of said substrate at said convex portion;
• comprising the step of bonding together said outer circumference portion of said first optical lens and an outer circumference portion of said second optical lens so that optical axes of said first and second optical lenses coincide or substantially coincide
• wherein said second optical lens has a first convex portion on one surface, a second convex portion on another surface opposing said one surface, and said outer circumference portion positioned around said first and second convex portions, and center axes of said first and second convex portions coinciding or substantially coinciding.

An optical pickup, comprising:

• a laser;
• an optical system for focusing laser light from said laser on an optical disk;
• and
• a photodetector for receiving said laser light reflected at said optical disk;
• wherein:
• said optical system comprises first and second optical lenses arranged so that their optical axes coincide or substantially coincide;
• said second optical lens passes the laser light from said laser and supplies it to said first optical lens;
• said first optical lens has a substrate comprised of an optical material;
• said substrate has a convex portion for focusing laser light from second optical lens on said optical disk and an outer circumference portion positioned around said convex portion;
• a thickness of said substrate at said outer circumference portion is greater than a thickness of said substrate at said convex portion;
• and
• the outer circumference portion of said first optical lens and an outer circumference portion of said second optical lens are fixed in place relative to each other so that said convex portion of said first optical lens faces said second optical lens.